EP 0507399 A2 19921007 - Circuit arrangement.
Title (en)
Circuit arrangement.
Title (de)
Schaltungsanordnung.
Title (fr)
Dispositif de circuit.
Publication
Application
Priority
EP 91200780 A 19910404
Abstract (en)
The invention relates to a circuit arrangement for operating a discharge lamp (L) with a substantially constant power PL by means of a switch mode power supply with variable input current Io and provided with periodically switching switching means (10) for controlling the variable input current by means of a drive signal. The drive signal generated in a drive circuit (V) is formed from a signal S1 which is proportional on the one hand to the input current and on the other hand to the lamp voltage VL and a reference signal. The circuit arrangement comprises means (IV) for generating signal S1. The power PL by good approximation thereby satisfies the relation PL = VbIo - K2/VL in which Vb = supply source voltage VL = lamp voltage K2 = proportionality constant. <IMAGE>
IPC 1-7
IPC 8 full level
H05B 41/16 (2006.01); H05B 41/24 (2006.01); H05B 41/282 (2006.01); H05B 41/392 (2006.01)
CPC (source: EP KR US)
G05F 1/10 (2013.01 - KR); H05B 41/282 (2013.01 - EP US); H05B 41/392 (2013.01 - EP US); Y02B 20/00 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE DE FR GB IT
DOCDB simple family (publication)
EP 0507399 A2 19921007; EP 0507399 A3 19931013; EP 0507399 B1 19981209; AT E174465 T1 19981215; DE 69227794 D1 19990121; DE 69227794 T2 19990624; JP H05121187 A 19930518; KR 100239098 B1 20000115; KR 920020300 A 19921120; TW 235383 B 19941201; US 5235255 A 19930810
DOCDB simple family (application)
EP 92200896 A 19920330; AT 92200896 T 19920330; DE 69227794 T 19920330; JP 10931892 A 19920401; KR 920005487 A 19920402; TW 80105704 A 19910723; US 86204892 A 19920402